Yeah I just checked, there is timecyc mod. I have tested it with another server which also results in the same of weather rain being disappear. I've install default timecyc and hoping to get an unban. I'm truly sorry for not knowing it. Atleast leave me with a warning first and I could have removed it the second I know it.

I don't have any rain mod supposely, but I don't know if its there hidden in a modpack which are mostly graphic mods.

There's a really high chance you're using a modded timecyc which is the file that the game uses to handle all kinds of weather within it. Now, when i banned you we all were racing with weather set on rain and since you probably had a modded timecyc your mod either straight removed the rain from the original game or somehow edited the way it works and consequently gave you a big advantage over people with default timecyc.

Here's a video. It's short because i forgot to hit the record button earlier but if you know how this game works when the weather is rainy, you can tell your car was way too stable to be legit.

That's it. Unban at 26/02/2021. Please keep in mind that every time you'll get caught evading (joining the server while you're banned) a week will be added to that date.